ORIGINAL: dszabo2
You are right in that the Nitro content is an unknown and may be the cause of an early death to the pump. Another factor may be the concentration of alcohol. Nitro fuel is 65% methonal and I would guess WW fluid is less than 50% alcohol.
Methanol is methanol. Some WW fluid is higher in meth content than others. Up to about 40%. I set up methanol injection on my 2006 Charger as an experiment W/nitrous. It didn't pan out & the pump that was included in the meth injection kit soon failed as it was a standard RV water pump.
If a WW pump can witstand 40% meth over many years/miles in a car I think it would hold up to glow fuel if the nitro isn't a factor.
On another note:
I bought a Hobbico "Top Fueler MK II" 2-way pump in 1997 when I started the hobby.
It had about 30 gallons of fuel pumped through it when I stopped flying in 1998.
After 14 years of sitting on a partialy full gallon of 15% Cool Power W/O being flushed, it was nearly locked up, barely running & not pumping any fuel. W/the pump running I pressureized the bottle by blowing into it. The pump picked up prime, the fuel soon flushed it out & it is working like new. I have pumped over 5 gallons of fuel through it since it was resurected.
I don't think I could think of a better, more durable glow fuel pump after those results.